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Make a Grid

  1. const cellSize = 25;
  2. const cols = 10;
  3. const rows = 20;
  4.  
  5. function makeDot(x, y) {
  6.   const dot = document.body.appendChild(
  7.     document.createElement('div')
  8.   );
  9.  
  10.   dot.classList.add('cell');
  11.  
  12.   Object.assign(dot.style, {
  13.     position: 'absolute',
  14.     left: `${x}px`,
  15.     top: `${y}px`,
  16.     width: `${cellSize}px`,
  17.     height: `${cellSize}px`,
  18.     outline: '1px solid black',
  19.     cursor: 'pointer',
  20.     background: 'gray'
  21.   });
  22.  
  23.   return dot;
  24. }
  25.  
  26. for (let y = 0; y < rows; y++) {
  27.   for (let x = 0; x < cols; x++) {
  28.     makeDot(x * cellSize, y * cellSize);
  29.   }
  30. }
  31.  
  32. // make a cell red when it is rolled over
  33. document.addEventListener('mouseover', e => {
  34.   if (e.target.classList.contains('cell')) {
  35.     e.target.style.background = 'red';
  36.   }
  37. });

Here is a simple example for arranging divs in a grid.

// css // dom // javascript // math // tricks // ui
snippet.zone ~ 2021-22 /// {s/z}